kopia lustrzana https://github.com/jamescoxon/dl-fldigi
131 wiersze
5.0 KiB
Plaintext
131 wiersze
5.0 KiB
Plaintext
/**
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\page ui_configuration_waterfall_page Waterfall Configuration
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\tableofcontents
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\image html config-ui-tabs.png "UI Tabs"
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\image latex config-ui-tabs.png "UI Tabs" width=5.0in
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<br>
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\image html config-wf-display.png "UI Waterfall Display"
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\image latex config-wf-display.png "UI Waterfall Display" width=5.0in
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<br>
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The waterfall palette or color scheme can be altered to suit your
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personal tastes and visual needs. When fldigi is first started it
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creates a wide range of pre-built palettes in the $HOME/.fldigi folder.
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The "Load" button gives you access to those palettes. You
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may change any palette by clicking on the various color buttons beneath
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the palette sample. A color picker opens for you to select the
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color by various means including specifying the RGB values. If
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you create a palette that suits you better than any of the prebuilt
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ones you can "Save" the palette.
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<br>
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The waterfall cursor is a set of markers on the frequency scale
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that are spaced a signal bandwidth apart. You canadd a pair
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of lines that drop down from those two markers for the full
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height of the waterfall by selecting Cursor BW. You can add a
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center line cursor to this pair of BW line by selecting Cursor Center line.
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You can also add a set of BW lines that straddle the received
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signal tracking point by selecting Bandwidth tracks. All three of these
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options are color selectable. Click on the colored button below the
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check box and a color selection dialog will open.
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<br>
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The frequency scale defaults to RF frequency. You can select to show
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audio frequencies.
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<br>
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You can monitor the transmitted audio waveform and also set the level of
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the monitored signal. This IS NOT your final transmitted signal!
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<br>
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Fldigi can set a notch from the waterfall when used with flrig and a
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transceiver that supports CAT control of a manual notch filter.
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When the notch is engaged a dotted vertical line is placed on the
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waterfall at the notch location. You can configure the color of
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the dotted notch indicator.
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<br>
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\section configure_fft_waterfall FFT Waterfall
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\image html config-wf-fft.png "UI Waterfall Display"
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\image latex config-wf-fft.png "UI Waterfall Display" width=5.0in
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<br>
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You can extinguish the display of received signals below a particular audio
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frequency.
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<br>
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Fldigi's waterfall FFT has a bin size of 1 Hz. With an FFT
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of 8192 and a sampling rate of 8000 it takes almost a second to
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accumulate enough data to perform the full FFT. A waterfall that
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dropped at one scan line per second would be hard on the viewer, so
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fldigi uses a first-in-first-out (FIFO) 8192 byte buffer for the FFT data.
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512 byte audio blocks move through the buffer with each successive
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read of the sound card. The full buffer of 8192 samples is used to
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compute the FFT. That means that data in the FFT can have a
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latency of 8 scans. This provides excellent frequency resolution but
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poor time resolution (the vertical waterfall appearance).
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The latency control allows you to select the number of 512 byte blocks that
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are used for the FFT. The default latency is set to 4. You should be able to
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achieve a reasonable compromise between the time and frequency
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domain resolutions.
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<br>
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FFT averaging can be used to smooth the waterfall display in the frequency
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domain.
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<br>
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The FFT Prefilter or window function is used to reduce aliasing in the
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FFT computation.
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<br>
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The default prefilter for the Fast Fourier Transform associated with the
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waterfall is <i>Blackman</i>. You can try the other windowing filter.
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Under some conditions you might prefer one of those. The Blackman window has
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proven best for my setup.
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<br>
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\section waterfall_mouse_behavior Waterfall Mouse Behavior
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\image html config-wf-mouse.png "UI Waterfall Mouse Behavior"
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\image latex config-wf-mouse.png "UI Waterfall Mouse Behavior" width=5.0in
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<br>
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The mouse behavior in the waterfall panel can be controlled to suit your
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particular operating style. You might want to replay the saved
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audio history every time you either left click to select or right click
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to preview a particular signal. You can move the transceiver
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frequency in increments of 100 Hz by dragging the waterfall scale.
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You can also choose to insert a line of text into the Rx panel
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each time you left click a waterfall signal. The text can include
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expandable macro tags.
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<br>
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\subsection waterfall_mouse_behavior_tailoring Waterfall Mouse Behavior Tailoring
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The mouse wheel behavior can also be tailored to your liking:
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<br>
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<ul>
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<li>None - no mouse wheel activity in waterfall panel</li>
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<li>AFC range or BW - adjust the AFC range/BW up/down</li>
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<li>Squelch level - adjust the squelch level up/down</li>
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<li>Signal search - search up / down for next signal in current mode</li>
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<li>Modem carrier - adjust the audio tracking point +/- Hz increments</li>
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<li>Modem - select modem type from a full rotary of available modems</li>
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<li>Scroll - move the waterfall left/right in 100 Hz increments (for 2x, 4x expanded waterfall view)</li>
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</ul>
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<br>
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\ref ui_configuration_waterfall_page "Return to Top of Page"
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<br>
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\ref main_page "Return to Main Page"
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*/
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